The DDR Museum is definitely top of my list of places to take the children. It is a fantastic interactive museum that actually encourages its visitors to get involved and touch as much as they like. Whilst learning about what life was like for Berlin citizens in the GDR, you can rummage through drawers, drive a Trabi and even smell what what a GDR kitchen smelt like! This is definitely a great way to introduce children to museums and learning without them even realising it, and something you can enjoy too!
Computerspielemuseum (Computer Museum) is a great place to take children who are interested in gaming. Featuring games from Pac Mac to modern day games, there are over 300 exhibits that invite you to sit down and play games you would not usually get the chance to try. You can try vintage arcade games, play with an classic joystick or even Pong - a vintage table tennis game. Probably best for over seven's, it is good to note that under 5's can enter for free. It is a great way to kill a couple of hours and give your children something a bit different to do once they are tired of the usual sightseeing.
Another way to see the city is by water and take a river cruise. The kids will love sailing down the water and spotting the sites and you will get a few minutes to rest your legs and feel the breeze in your hair. It's a little known fact that Berlin waterways have more bridges than Venice and on a warm day it's a different way to take in the sites.
For a great view of the city there are two places to go - up the TV Tower or into the Reichstag. I would recommend the Reichstag for children as there is a lot more freedom for them to move about and look around and I think smaller children wouldn't really get much from the TV Tower. Not only is the Reichstag free but it is extremely buggy friendly, so great for families. Do make sure you book in advance though, and try and go at less busy times so the children don't have to suffer the crowds.
*Bonus Tip: Spot the bears! There are 100 'Buddy Bears' all over the city - for a bit of extra fun, why not see how many you can spot whilst you travel around!
*Thanks to Jet2.com for a fantastic break. Opinions are my own.